drivers/usb/cdns3/ep0.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Cadence USBSS DRD Driver - gadget side.
   4  *
   5  * Copyright (C) 2018 Cadence Design Systems.
   6  * Copyright (C) 2017-2018 NXP
   7  *
   8  * Authors: Pawel Jez <[email protected]>,
   9  *          Pawel Laszczak <[email protected]>
  10  *          Peter Chen <[email protected]>
  11  */
  12
  13 #include <linux/usb/composite.h>
  14 #include <linux/iopoll.h>
  15
  16 #include "gadget.h"
  17 #include "trace.h"
  18
  19 static struct usb_endpoint_descriptor cdns3_gadget_ep0_desc = {
  20         .bLength = USB_DT_ENDPOINT_SIZE,
  21         .bDescriptorType = USB_DT_ENDPOINT,
  22         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
  23 };
  24
  25 /**
  26  * cdns3_ep0_run_transfer - Do transfer on default endpoint hardware
  27  * @priv_dev: extended gadget object
  28  * @dma_addr: physical address where data is/will be stored
  29  * @length: data length
  30  * @erdy: set it to 1 when ERDY packet should be sent -
  31  *        exit from flow control state
  32  */
  33 static void cdns3_ep0_run_transfer(struct cdns3_device *priv_dev,
  34                                    dma_addr_t dma_addr,
  35                                    unsigned int length, int erdy, int zlp)
  36 {
  37         struct cdns3_usb_regs __iomem *regs = priv_dev->regs;
  38         struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
  39
  40         priv_ep->trb_pool[0].buffer = TRB_BUFFER(dma_addr);
  41         priv_ep->trb_pool[0].length = TRB_LEN(length);
  42
  43         if (zlp) {
  44                 priv_ep->trb_pool[0].control = TRB_CYCLE | TRB_TYPE(TRB_NORMAL);
  45                 priv_ep->trb_pool[1].buffer = TRB_BUFFER(dma_addr);
  46                 priv_ep->trb_pool[1].length = TRB_LEN(0);
  47                 priv_ep->trb_pool[1].control = TRB_CYCLE | TRB_IOC |
  48                     TRB_TYPE(TRB_NORMAL);
  49         } else {
  50                 priv_ep->trb_pool[0].control = TRB_CYCLE | TRB_IOC |
  51                     TRB_TYPE(TRB_NORMAL);
  52                 priv_ep->trb_pool[1].control = 0;
  53         }
  54
  55         trace_cdns3_prepare_trb(priv_ep, priv_ep->trb_pool);
  56
  57         cdns3_select_ep(priv_dev, priv_dev->ep0_data_dir);
  58
  59         writel(EP_STS_TRBERR, &regs->ep_sts);
  60         writel(EP_TRADDR_TRADDR(priv_ep->trb_pool_dma), &regs->ep_traddr);
  61         trace_cdns3_doorbell_ep0(priv_dev->ep0_data_dir ? "ep0in" : "ep0out",
  62                                  readl(&regs->ep_traddr));
  63
  64         /* TRB should be prepared before starting transfer. */
  65         writel(EP_CMD_DRDY, &regs->ep_cmd);
  66
  67         /* Resume controller before arming transfer. */
  68         __cdns3_gadget_wakeup(priv_dev);
  69
  70         if (erdy)
  71                 writel(EP_CMD_ERDY, &priv_dev->regs->ep_cmd);
  72 }
  73
  74 /**
  75  * cdns3_ep0_delegate_req - Returns status of handling setup packet
  76  * Setup is handled by gadget driver
  77  * @priv_dev: extended gadget object
  78  * @ctrl_req: pointer to received setup packet
  79  *
  80  * Returns zero on success or negative value on failure
  81  */
  82 static int cdns3_ep0_delegate_req(struct cdns3_device *priv_dev,
  83                                   struct usb_ctrlrequest *ctrl_req)
  84 {
  85         int ret;
  86
  87         spin_unlock(&priv_dev->lock);
  88         priv_dev->setup_pending = 1;
  89         ret = priv_dev->gadget_driver->setup(&priv_dev->gadget, ctrl_req);
  90         priv_dev->setup_pending = 0;
  91         spin_lock(&priv_dev->lock);
  92         return ret;
  93 }
  94
  95 static void cdns3_prepare_setup_packet(struct cdns3_device *priv_dev)
  96 {
  97         priv_dev->ep0_data_dir = 0;
  98         priv_dev->ep0_stage = CDNS3_SETUP_STAGE;
  99         cdns3_ep0_run_transfer(priv_dev, priv_dev->setup_dma,
 100                                sizeof(struct usb_ctrlrequest), 0, 0);
 101 }
 102
 103 static void cdns3_ep0_complete_setup(struct cdns3_device *priv_dev,
 104                                      u8 send_stall, u8 send_erdy)
 105 {
 106         struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
 107         struct usb_request *request;
 108
 109         request = cdns3_next_request(&priv_ep->pending_req_list);
 110         if (request)
 111                 list_del_init(&request->list);
 112
 113         if (send_stall) {
 114                 trace_cdns3_halt(priv_ep, send_stall, 0);
 115                 /* set_stall on ep0 */
 116                 cdns3_select_ep(priv_dev, 0x00);
 117                 writel(EP_CMD_SSTALL, &priv_dev->regs->ep_cmd);
 118         } else {
 119                 cdns3_prepare_setup_packet(priv_dev);
 120         }
 121
 122         priv_dev->ep0_stage = CDNS3_SETUP_STAGE;
 123         writel((send_erdy ? EP_CMD_ERDY : 0) | EP_CMD_REQ_CMPL,
 124                &priv_dev->regs->ep_cmd);
 125
 126         cdns3_allow_enable_l1(priv_dev, 1);
 127 }
 128
 129 /**
 130  * cdns3_req_ep0_set_configuration - Handling of SET_CONFIG standard USB request
 131  * @priv_dev: extended gadget object
 132  * @ctrl_req: pointer to received setup packet
 133  *
 134  * Returns 0 if success, USB_GADGET_DELAYED_STATUS on deferred status stage,
 135  * error code on error
 136  */
 137 static int cdns3_req_ep0_set_configuration(struct cdns3_device *priv_dev,
 138                                            struct usb_ctrlrequest *ctrl_req)
 139 {
 140         enum usb_device_state device_state = priv_dev->gadget.state;
 141         struct cdns3_endpoint *priv_ep;
 142         u32 config = le16_to_cpu(ctrl_req->wValue);
 143         int result = 0;
 144         int i;
 145
 146         switch (device_state) {
 147         case USB_STATE_ADDRESS:
 148                 /* Configure non-control EPs */
 149                 for (i = 0; i < CDNS3_ENDPOINTS_MAX_COUNT; i++) {
 150                         priv_ep = priv_dev->eps[i];
 151                         if (!priv_ep)
 152                                 continue;
 153
 154                         if (priv_ep->flags & EP_CLAIMED)
 155                                 cdns3_ep_config(priv_ep);
 156                 }
 157
 158                 result = cdns3_ep0_delegate_req(priv_dev, ctrl_req);
 159
 160                 if (result)
 161                         return result;
 162
 163                 if (config) {
 164                         cdns3_set_hw_configuration(priv_dev);
 165                 } else {
 166                         cdns3_hw_reset_eps_config(priv_dev);
 167                         usb_gadget_set_state(&priv_dev->gadget,
 168                                              USB_STATE_ADDRESS);
 169                 }
 170                 break;
 171         case USB_STATE_CONFIGURED:
 172                 result = cdns3_ep0_delegate_req(priv_dev, ctrl_req);
 173
 174                 if (!config && !result) {
 175                         cdns3_hw_reset_eps_config(priv_dev);
 176                         usb_gadget_set_state(&priv_dev->gadget,
 177                                              USB_STATE_ADDRESS);
 178                 }
 179                 break;
 180         default:
 181                 result = -EINVAL;
 182         }
 183
 184         return result;
 185 }
 186
 187 /**
 188  * cdns3_req_ep0_set_address - Handling of SET_ADDRESS standard USB request
 189  * @priv_dev: extended gadget object
 190  * @ctrl_req: pointer to received setup packet
 191  *
 192  * Returns 0 if success, error code on error
 193  */
 194 static int cdns3_req_ep0_set_address(struct cdns3_device *priv_dev,
 195                                      struct usb_ctrlrequest *ctrl_req)
 196 {
 197         enum usb_device_state device_state = priv_dev->gadget.state;
 198         u32 reg;
 199         u32 addr;
 200
 201         addr = le16_to_cpu(ctrl_req->wValue);
 202
 203         if (addr > USB_DEVICE_MAX_ADDRESS) {
 204                 dev_err(priv_dev->dev,
 205                         "Device address (%d) cannot be greater than %d\n",
 206                         addr, USB_DEVICE_MAX_ADDRESS);
 207                 return -EINVAL;
 208         }
 209
 210         if (device_state == USB_STATE_CONFIGURED) {
 211                 dev_err(priv_dev->dev,
 212                         "can't set_address from configured state\n");
 213                 return -EINVAL;
 214         }
 215
 216         reg = readl(&priv_dev->regs->usb_cmd);
 217
 218         writel(reg | USB_CMD_FADDR(addr) | USB_CMD_SET_ADDR,
 219                &priv_dev->regs->usb_cmd);
 220
 221         usb_gadget_set_state(&priv_dev->gadget,
 222                              (addr ? USB_STATE_ADDRESS : USB_STATE_DEFAULT));
 223
 224         return 0;
 225 }
 226
 227 /**
 228  * cdns3_req_ep0_get_status - Handling of GET_STATUS standard USB request
 229  * @priv_dev: extended gadget object
 230  * @ctrl_req: pointer to received setup packet
 231  *
 232  * Returns 0 if success, error code on error
 233  */
 234 static int cdns3_req_ep0_get_status(struct cdns3_device *priv_dev,
 235                                     struct usb_ctrlrequest *ctrl)
 236 {
 237         __le16 *response_pkt;
 238         u16 usb_status = 0;
 239         u32 recip;
 240
 241         recip = ctrl->bRequestType & USB_RECIP_MASK;
 242
 243         switch (recip) {
 244         case USB_RECIP_DEVICE:
 245                 /* self powered */
 246                 if (priv_dev->is_selfpowered)
 247                         usb_status = BIT(USB_DEVICE_SELF_POWERED);
 248
 249                 if (priv_dev->wake_up_flag)
 250                         usb_status |= BIT(USB_DEVICE_REMOTE_WAKEUP);
 251
 252                 if (priv_dev->gadget.speed != USB_SPEED_SUPER)
 253                         break;
 254
 255                 if (priv_dev->u1_allowed)
 256                         usb_status |= BIT(USB_DEV_STAT_U1_ENABLED);
 257
 258                 if (priv_dev->u2_allowed)
 259                         usb_status |= BIT(USB_DEV_STAT_U2_ENABLED);
 260
 261                 break;
 262         case USB_RECIP_INTERFACE:
 263                 return cdns3_ep0_delegate_req(priv_dev, ctrl);
 264         case USB_RECIP_ENDPOINT:
 265                 /* check if endpoint is stalled */
 266                 cdns3_select_ep(priv_dev, ctrl->wIndex);
 267                 if (EP_STS_STALL(readl(&priv_dev->regs->ep_sts)))
 268                         usb_status =  BIT(USB_ENDPOINT_HALT);
 269                 break;
 270         default:
 271                 return -EINVAL;
 272         }
 273
 274         response_pkt = (__le16 *)priv_dev->setup_buf;
 275         *response_pkt = cpu_to_le16(usb_status);
 276
 277         cdns3_ep0_run_transfer(priv_dev, priv_dev->setup_dma,
 278                                sizeof(*response_pkt), 1, 0);
 279         return 0;
 280 }
 281
 282 static int cdns3_ep0_feature_handle_device(struct cdns3_device *priv_dev,
 283                                            struct usb_ctrlrequest *ctrl,
 284                                            int set)
 285 {
 286         enum usb_device_state state;
 287         enum usb_device_speed speed;
 288         int ret = 0;
 289         u32 wValue;
 290         u16 tmode;
 291
 292         wValue = le16_to_cpu(ctrl->wValue);
 293         state = priv_dev->gadget.state;
 294         speed = priv_dev->gadget.speed;
 295
 296         switch (wValue) {
 297         case USB_DEVICE_REMOTE_WAKEUP:
 298                 priv_dev->wake_up_flag = !!set;
 299                 break;
 300         case USB_DEVICE_U1_ENABLE:
 301                 if (state != USB_STATE_CONFIGURED || speed != USB_SPEED_SUPER)
 302                         return -EINVAL;
 303
 304                 priv_dev->u1_allowed = !!set;
 305                 break;
 306         case USB_DEVICE_U2_ENABLE:
 307                 if (state != USB_STATE_CONFIGURED || speed != USB_SPEED_SUPER)
 308                         return -EINVAL;
 309
 310                 priv_dev->u2_allowed = !!set;
 311                 break;
 312         case USB_DEVICE_LTM_ENABLE:
 313                 ret = -EINVAL;
 314                 break;
 315         case USB_DEVICE_TEST_MODE:
 316                 if (state != USB_STATE_CONFIGURED || speed > USB_SPEED_HIGH)
 317                         return -EINVAL;
 318
 319                 tmode = le16_to_cpu(ctrl->wIndex);
 320
 321                 if (!set || (tmode & 0xff) != 0)
 322                         return -EINVAL;
 323
 324                 switch (tmode >> 8) {
 325                 case TEST_J:
 326                 case TEST_K:
 327                 case TEST_SE0_NAK:
 328                 case TEST_PACKET:
 329                         cdns3_ep0_complete_setup(priv_dev, 0, 1);
 330                         /**
 331                          *  Little delay to give the controller some time
 332                          * for sending status stage.
 333                          * This time should be less then 3ms.
 334                          */
 335                         usleep_range(1000, 2000);
 336                         cdns3_set_register_bit(&priv_dev->regs->usb_cmd,
 337                                                USB_CMD_STMODE |
 338                                                USB_STS_TMODE_SEL(tmode - 1));
 339                         break;
 340                 default:
 341                         ret = -EINVAL;
 342                 }
 343                 break;
 344         default:
 345                 ret = -EINVAL;
 346         }
 347
 348         return ret;
 349 }
 350
 351 static int cdns3_ep0_feature_handle_intf(struct cdns3_device *priv_dev,
 352                                          struct usb_ctrlrequest *ctrl,
 353                                          int set)
 354 {
 355         u32 wValue;
 356         int ret = 0;
 357
 358         wValue = le16_to_cpu(ctrl->wValue);
 359
 360         switch (wValue) {
 361         case USB_INTRF_FUNC_SUSPEND:
 362                 break;
 363         default:
 364                 ret = -EINVAL;
 365         }
 366
 367         return ret;
 368 }
 369
 370 static int cdns3_ep0_feature_handle_endpoint(struct cdns3_device *priv_dev,
 371                                              struct usb_ctrlrequest *ctrl,
 372                                              int set)
 373 {
 374         struct cdns3_endpoint *priv_ep;
 375         int ret = 0;
 376         u8 index;
 377
 378         if (le16_to_cpu(ctrl->wValue) != USB_ENDPOINT_HALT)
 379                 return -EINVAL;
 380
 381         if (!(ctrl->wIndex & ~USB_DIR_IN))
 382                 return 0;
 383
 384         index = cdns3_ep_addr_to_index(ctrl->wIndex);
 385         priv_ep = priv_dev->eps[index];
 386
 387         cdns3_select_ep(priv_dev, ctrl->wIndex);
 388
 389         if (set)
 390                 __cdns3_gadget_ep_set_halt(priv_ep);
 391         else if (!(priv_ep->flags & EP_WEDGE))
 392                 ret = __cdns3_gadget_ep_clear_halt(priv_ep);
 393
 394         cdns3_select_ep(priv_dev, 0x00);
 395
 396         return ret;
 397 }
 398
 399 /**
 400  * cdns3_req_ep0_handle_feature -
 401  * Handling of GET/SET_FEATURE standard USB request
 402  *
 403  * @priv_dev: extended gadget object
 404  * @ctrl_req: pointer to received setup packet
 405  * @set: must be set to 1 for SET_FEATURE request
 406  *
 407  * Returns 0 if success, error code on error
 408  */
 409 static int cdns3_req_ep0_handle_feature(struct cdns3_device *priv_dev,
 410                                         struct usb_ctrlrequest *ctrl,
 411                                         int set)
 412 {
 413         int ret = 0;
 414         u32 recip;
 415
 416         recip = ctrl->bRequestType & USB_RECIP_MASK;
 417
 418         switch (recip) {
 419         case USB_RECIP_DEVICE:
 420                 ret = cdns3_ep0_feature_handle_device(priv_dev, ctrl, set);
 421                 break;
 422         case USB_RECIP_INTERFACE:
 423                 ret = cdns3_ep0_feature_handle_intf(priv_dev, ctrl, set);
 424                 break;
 425         case USB_RECIP_ENDPOINT:
 426                 ret = cdns3_ep0_feature_handle_endpoint(priv_dev, ctrl, set);
 427                 break;
 428         default:
 429                 return -EINVAL;
 430         }
 431
 432         return ret;
 433 }
 434
 435 /**
 436  * cdns3_req_ep0_set_sel - Handling of SET_SEL standard USB request
 437  * @priv_dev: extended gadget object
 438  * @ctrl_req: pointer to received setup packet
 439  *
 440  * Returns 0 if success, error code on error
 441  */
 442 static int cdns3_req_ep0_set_sel(struct cdns3_device *priv_dev,
 443                                  struct usb_ctrlrequest *ctrl_req)
 444 {
 445         if (priv_dev->gadget.state < USB_STATE_ADDRESS)
 446                 return -EINVAL;
 447
 448         if (ctrl_req->wLength != 6) {
 449                 dev_err(priv_dev->dev, "Set SEL should be 6 bytes, got %d\n",
 450                         ctrl_req->wLength);
 451                 return -EINVAL;
 452         }
 453
 454         cdns3_ep0_run_transfer(priv_dev, priv_dev->setup_dma, 6, 1, 0);
 455         return 0;
 456 }
 457
 458 /**
 459  * cdns3_req_ep0_set_isoch_delay -
 460  * Handling of GET_ISOCH_DELAY standard USB request
 461  * @priv_dev: extended gadget object
 462  * @ctrl_req: pointer to received setup packet
 463  *
 464  * Returns 0 if success, error code on error
 465  */
 466 static int cdns3_req_ep0_set_isoch_delay(struct cdns3_device *priv_dev,
 467                                          struct usb_ctrlrequest *ctrl_req)
 468 {
 469         if (ctrl_req->wIndex || ctrl_req->wLength)
 470                 return -EINVAL;
 471
 472         priv_dev->isoch_delay = ctrl_req->wValue;
 473
 474         return 0;
 475 }
 476
 477 /**
 478  * cdns3_ep0_standard_request - Handling standard USB requests
 479  * @priv_dev: extended gadget object
 480  * @ctrl_req: pointer to received setup packet
 481  *
 482  * Returns 0 if success, error code on error
 483  */
 484 static int cdns3_ep0_standard_request(struct cdns3_device *priv_dev,
 485                                       struct usb_ctrlrequest *ctrl_req)
 486 {
 487         int ret;
 488
 489         switch (ctrl_req->bRequest) {
 490         case USB_REQ_SET_ADDRESS:
 491                 ret = cdns3_req_ep0_set_address(priv_dev, ctrl_req);
 492                 break;
 493         case USB_REQ_SET_CONFIGURATION:
 494                 ret = cdns3_req_ep0_set_configuration(priv_dev, ctrl_req);
 495                 break;
 496         case USB_REQ_GET_STATUS:
 497                 ret = cdns3_req_ep0_get_status(priv_dev, ctrl_req);
 498                 break;
 499         case USB_REQ_CLEAR_FEATURE:
 500                 ret = cdns3_req_ep0_handle_feature(priv_dev, ctrl_req, 0);
 501                 break;
 502         case USB_REQ_SET_FEATURE:
 503                 ret = cdns3_req_ep0_handle_feature(priv_dev, ctrl_req, 1);
 504                 break;
 505         case USB_REQ_SET_SEL:
 506                 ret = cdns3_req_ep0_set_sel(priv_dev, ctrl_req);
 507                 break;
 508         case USB_REQ_SET_ISOCH_DELAY:
 509                 ret = cdns3_req_ep0_set_isoch_delay(priv_dev, ctrl_req);
 510                 break;
 511         default:
 512                 ret = cdns3_ep0_delegate_req(priv_dev, ctrl_req);
 513                 break;
 514         }
 515
 516         return ret;
 517 }
 518
 519 static void __pending_setup_status_handler(struct cdns3_device *priv_dev)
 520 {
 521         struct usb_request *request = priv_dev->pending_status_request;
 522
 523         if (priv_dev->status_completion_no_call && request &&
 524             request->complete) {
 525                 request->complete(&priv_dev->eps[0]->endpoint, request);
 526                 priv_dev->status_completion_no_call = 0;
 527         }
 528 }
 529
 530 void cdns3_pending_setup_status_handler(struct work_struct *work)
 531 {
 532         struct cdns3_device *priv_dev = container_of(work, struct cdns3_device,
 533                         pending_status_wq);
 534         unsigned long flags;
 535
 536         spin_lock_irqsave(&priv_dev->lock, flags);
 537         __pending_setup_status_handler(priv_dev);
 538         spin_unlock_irqrestore(&priv_dev->lock, flags);
 539 }
 540
 541 /**
 542  * cdns3_ep0_setup_phase - Handling setup USB requests
 543  * @priv_dev: extended gadget object
 544  */
 545 static void cdns3_ep0_setup_phase(struct cdns3_device *priv_dev)
 546 {
 547         struct usb_ctrlrequest *ctrl = priv_dev->setup_buf;
 548         struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
 549         int result;
 550
 551         priv_dev->ep0_data_dir = ctrl->bRequestType & USB_DIR_IN;
 552
 553         trace_cdns3_ctrl_req(ctrl);
 554
 555         if (!list_empty(&priv_ep->pending_req_list)) {
 556                 struct usb_request *request;
 557
 558                 request = cdns3_next_request(&priv_ep->pending_req_list);
 559                 priv_ep->dir = priv_dev->ep0_data_dir;
 560                 cdns3_gadget_giveback(priv_ep, to_cdns3_request(request),
 561                                       -ECONNRESET);
 562         }
 563
 564         if (le16_to_cpu(ctrl->wLength))
 565                 priv_dev->ep0_stage = CDNS3_DATA_STAGE;
 566         else
 567                 priv_dev->ep0_stage = CDNS3_STATUS_STAGE;
 568
 569         if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
 570                 result = cdns3_ep0_standard_request(priv_dev, ctrl);
 571         else
 572                 result = cdns3_ep0_delegate_req(priv_dev, ctrl);
 573
 574         if (result == USB_GADGET_DELAYED_STATUS)
 575                 return;
 576
 577         if (result < 0)
 578                 cdns3_ep0_complete_setup(priv_dev, 1, 1);
 579         else if (priv_dev->ep0_stage == CDNS3_STATUS_STAGE)
 580                 cdns3_ep0_complete_setup(priv_dev, 0, 1);
 581 }
 582
 583 static void cdns3_transfer_completed(struct cdns3_device *priv_dev)
 584 {
 585         struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
 586
 587         if (!list_empty(&priv_ep->pending_req_list)) {
 588                 struct usb_request *request;
 589
 590                 trace_cdns3_complete_trb(priv_ep, priv_ep->trb_pool);
 591                 request = cdns3_next_request(&priv_ep->pending_req_list);
 592
 593                 request->actual =
 594                         TRB_LEN(le32_to_cpu(priv_ep->trb_pool->length));
 595
 596                 priv_ep->dir = priv_dev->ep0_data_dir;
 597                 cdns3_gadget_giveback(priv_ep, to_cdns3_request(request), 0);
 598         }
 599
 600         cdns3_ep0_complete_setup(priv_dev, 0, 0);
 601 }
 602
 603 /**
 604  * cdns3_check_new_setup - Check if controller receive new SETUP packet.
 605  * @priv_dev: extended gadget object
 606  *
 607  * The SETUP packet can be kept in on-chip memory or in system memory.
 608  */
 609 static bool cdns3_check_new_setup(struct cdns3_device *priv_dev)
 610 {
 611         u32 ep_sts_reg;
 612
 613         cdns3_select_ep(priv_dev, 0 | USB_DIR_OUT);
 614         ep_sts_reg = readl(&priv_dev->regs->ep_sts);
 615
 616         return !!(ep_sts_reg & (EP_STS_SETUP | EP_STS_STPWAIT));
 617 }
 618
 619 /**
 620  * cdns3_check_ep0_interrupt_proceed - Processes interrupt related to endpoint 0
 621  * @priv_dev: extended gadget object
 622  * @dir: USB_DIR_IN for IN direction, USB_DIR_OUT for OUT direction
 623  */
 624 void cdns3_check_ep0_interrupt_proceed(struct cdns3_device *priv_dev, int dir)
 625 {
 626         u32 ep_sts_reg;
 627
 628         cdns3_select_ep(priv_dev, dir);
 629
 630         ep_sts_reg = readl(&priv_dev->regs->ep_sts);
 631         writel(ep_sts_reg, &priv_dev->regs->ep_sts);
 632
 633         trace_cdns3_ep0_irq(priv_dev, ep_sts_reg);
 634
 635         __pending_setup_status_handler(priv_dev);
 636
 637         if (ep_sts_reg & EP_STS_SETUP)
 638                 priv_dev->wait_for_setup = 1;
 639
 640         if (priv_dev->wait_for_setup && ep_sts_reg & EP_STS_IOC) {
 641                 priv_dev->wait_for_setup = 0;
 642                 cdns3_allow_enable_l1(priv_dev, 0);
 643                 cdns3_ep0_setup_phase(priv_dev);
 644         } else if ((ep_sts_reg & EP_STS_IOC) || (ep_sts_reg & EP_STS_ISP)) {
 645                 priv_dev->ep0_data_dir = dir;
 646                 cdns3_transfer_completed(priv_dev);
 647         }
 648
 649         if (ep_sts_reg & EP_STS_DESCMIS) {
 650                 if (dir == 0 && !priv_dev->setup_pending)
 651                         cdns3_prepare_setup_packet(priv_dev);
 652         }
 653 }
 654
 655 /**
 656  * cdns3_gadget_ep0_enable
 657  * Function shouldn't be called by gadget driver,
 658  * endpoint 0 is allways active
 659  */
 660 static int cdns3_gadget_ep0_enable(struct usb_ep *ep,
 661                                    const struct usb_endpoint_descriptor *desc)
 662 {
 663         return -EINVAL;
 664 }
 665
 666 /**
 667  * cdns3_gadget_ep0_disable
 668  * Function shouldn't be called by gadget driver,
 669  * endpoint 0 is allways active
 670  */
 671 static int cdns3_gadget_ep0_disable(struct usb_ep *ep)
 672 {
 673         return -EINVAL;
 674 }
 675
 676 /**
 677  * cdns3_gadget_ep0_set_halt
 678  * @ep: pointer to endpoint zero object
 679  * @value: 1 for set stall, 0 for clear stall
 680  *
 681  * Returns 0
 682  */
 683 static int cdns3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
 684 {
 685         /* TODO */
 686         return 0;
 687 }
 688
 689 /**
 690  * cdns3_gadget_ep0_queue Transfer data on endpoint zero
 691  * @ep: pointer to endpoint zero object
 692  * @request: pointer to request object
 693  * @gfp_flags: gfp flags
 694  *
 695  * Returns 0 on success, error code elsewhere
 696  */
 697 static int cdns3_gadget_ep0_queue(struct usb_ep *ep,
 698                                   struct usb_request *request,
 699                                   gfp_t gfp_flags)
 700 {
 701         struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
 702         struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
 703         unsigned long flags;
 704         int erdy_sent = 0;
 705         int ret = 0;
 706         u8 zlp = 0;
 707
 708         trace_cdns3_ep0_queue(priv_dev, request);
 709
 710         /* cancel the request if controller receive new SETUP packet. */
 711         if (cdns3_check_new_setup(priv_dev))
 712                 return -ECONNRESET;
 713
 714         /* send STATUS stage. Should be called only for SET_CONFIGURATION */
 715         if (priv_dev->ep0_stage == CDNS3_STATUS_STAGE) {
 716                 spin_lock_irqsave(&priv_dev->lock, flags);
 717                 cdns3_select_ep(priv_dev, 0x00);
 718
 719                 erdy_sent = !priv_dev->hw_configured_flag;
 720                 cdns3_set_hw_configuration(priv_dev);
 721
 722                 if (!erdy_sent)
 723                         cdns3_ep0_complete_setup(priv_dev, 0, 1);
 724
 725                 cdns3_allow_enable_l1(priv_dev, 1);
 726
 727                 request->actual = 0;
 728                 priv_dev->status_completion_no_call = true;
 729                 priv_dev->pending_status_request = request;
 730                 spin_unlock_irqrestore(&priv_dev->lock, flags);
 731
 732                 /*
 733                  * Since there is no completion interrupt for status stage,
 734                  * it needs to call ->completion in software after
 735                  * ep0_queue is back.
 736                  */
 737                 queue_work(system_freezable_wq, &priv_dev->pending_status_wq);
 738                 return 0;
 739         }
 740
 741         spin_lock_irqsave(&priv_dev->lock, flags);
 742         if (!list_empty(&priv_ep->pending_req_list)) {
 743                 dev_err(priv_dev->dev,
 744                         "can't handle multiple requests for ep0\n");
 745                 spin_unlock_irqrestore(&priv_dev->lock, flags);
 746                 return -EBUSY;
 747         }
 748
 749         ret = usb_gadget_map_request_by_dev(priv_dev->sysdev, request,
 750                                             priv_dev->ep0_data_dir);
 751         if (ret) {
 752                 spin_unlock_irqrestore(&priv_dev->lock, flags);
 753                 dev_err(priv_dev->dev, "failed to map request\n");
 754                 return -EINVAL;
 755         }
 756
 757         request->status = -EINPROGRESS;
 758         list_add_tail(&request->list, &priv_ep->pending_req_list);
 759
 760         if (request->zero && request->length &&
 761             (request->length % ep->maxpacket == 0))
 762                 zlp = 1;
 763
 764         cdns3_ep0_run_transfer(priv_dev, request->dma, request->length, 1, zlp);
 765
 766         spin_unlock_irqrestore(&priv_dev->lock, flags);
 767
 768         return ret;
 769 }
 770
 771 /**
 772  * cdns3_gadget_ep_set_wedge Set wedge on selected endpoint
 773  * @ep: endpoint object
 774  *
 775  * Returns 0
 776  */
 777 int cdns3_gadget_ep_set_wedge(struct usb_ep *ep)
 778 {
 779         struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
 780         struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
 781
 782         dev_dbg(priv_dev->dev, "Wedge for %s\n", ep->name);
 783         cdns3_gadget_ep_set_halt(ep, 1);
 784         priv_ep->flags |= EP_WEDGE;
 785
 786         return 0;
 787 }
 788
 789 const struct usb_ep_ops cdns3_gadget_ep0_ops = {
 790         .enable = cdns3_gadget_ep0_enable,
 791         .disable = cdns3_gadget_ep0_disable,
 792         .alloc_request = cdns3_gadget_ep_alloc_request,
 793         .free_request = cdns3_gadget_ep_free_request,
 794         .queue = cdns3_gadget_ep0_queue,
 795         .dequeue = cdns3_gadget_ep_dequeue,
 796         .set_halt = cdns3_gadget_ep0_set_halt,
 797         .set_wedge = cdns3_gadget_ep_set_wedge,
 798 };
 799
 800 /**
 801  * cdns3_ep0_config - Configures default endpoint
 802  * @priv_dev: extended gadget object
 803  *
 804  * Functions sets parameters: maximal packet size and enables interrupts
 805  */
 806 void cdns3_ep0_config(struct cdns3_device *priv_dev)
 807 {
 808         struct cdns3_usb_regs __iomem *regs;
 809         struct cdns3_endpoint *priv_ep;
 810         u32 max_packet_size = 64;
 811
 812         regs = priv_dev->regs;
 813
 814         if (priv_dev->gadget.speed == USB_SPEED_SUPER)
 815                 max_packet_size = 512;
 816
 817         priv_ep = priv_dev->eps[0];
 818
 819         if (!list_empty(&priv_ep->pending_req_list)) {
 820                 struct usb_request *request;
 821
 822                 request = cdns3_next_request(&priv_ep->pending_req_list);
 823                 list_del_init(&request->list);
 824         }
 825
 826         priv_dev->u1_allowed = 0;
 827         priv_dev->u2_allowed = 0;
 828
 829         priv_dev->gadget.ep0->maxpacket = max_packet_size;
 830         cdns3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(max_packet_size);
 831
 832         /* init ep out */
 833         cdns3_select_ep(priv_dev, USB_DIR_OUT);
 834
 835         if (priv_dev->dev_ver >= DEV_VER_V3) {
 836                 cdns3_set_register_bit(&priv_dev->regs->dtrans,
 837                                        BIT(0) | BIT(16));
 838                 cdns3_set_register_bit(&priv_dev->regs->tdl_from_trb,
 839                                        BIT(0) | BIT(16));
 840         }
 841
 842         writel(EP_CFG_ENABLE | EP_CFG_MAXPKTSIZE(max_packet_size),
 843                &regs->ep_cfg);
 844
 845         writel(EP_STS_EN_SETUPEN | EP_STS_EN_DESCMISEN | EP_STS_EN_TRBERREN,
 846                &regs->ep_sts_en);
 847
 848         /* init ep in */
 849         cdns3_select_ep(priv_dev, USB_DIR_IN);
 850
 851         writel(EP_CFG_ENABLE | EP_CFG_MAXPKTSIZE(max_packet_size),
 852                &regs->ep_cfg);
 853
 854         writel(EP_STS_EN_SETUPEN | EP_STS_EN_TRBERREN, &regs->ep_sts_en);
 855
 856         cdns3_set_register_bit(&regs->usb_conf, USB_CONF_U1DS | USB_CONF_U2DS);
 857 }
 858
 859 /**
 860  * cdns3_init_ep0 Initializes software endpoint 0 of gadget
 861  * @priv_dev: extended gadget object
 862  * @ep_priv: extended endpoint object
 863  *
 864  * Returns 0 on success else error code.
 865  */
 866 int cdns3_init_ep0(struct cdns3_device *priv_dev,
 867                    struct cdns3_endpoint *priv_ep)
 868 {
 869         sprintf(priv_ep->name, "ep0");
 870
 871         /* fill linux fields */
 872         priv_ep->endpoint.ops = &cdns3_gadget_ep0_ops;
 873         priv_ep->endpoint.maxburst = 1;
 874         usb_ep_set_maxpacket_limit(&priv_ep->endpoint,
 875                                    CDNS3_EP0_MAX_PACKET_LIMIT);
 876         priv_ep->endpoint.address = 0;
 877         priv_ep->endpoint.caps.type_control = 1;
 878         priv_ep->endpoint.caps.dir_in = 1;
 879         priv_ep->endpoint.caps.dir_out = 1;
 880         priv_ep->endpoint.name = priv_ep->name;
 881         priv_ep->endpoint.desc = &cdns3_gadget_ep0_desc;
 882         priv_dev->gadget.ep0 = &priv_ep->endpoint;
 883         priv_ep->type = USB_ENDPOINT_XFER_CONTROL;
 884
 885         return cdns3_allocate_trb_pool(priv_ep);
 886 }